County Maps US

Adams County, Pennsylvania

A county in Pennsylvania, ranked 31 of 67 by population.

CountyFIPS 42001

Within Pennsylvania
Adams County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Gettysburg, the county seat, located via the 2025 Census Gazetteer.

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Population
107,594
+3,780 (+3.6%) since 2020
Land area
518.6
square miles. A further 0.6% of the total area is water
Population density
207
people per square mile, computed rather than published
County seat
Gettysburg
Seat of county government.
Established
1800
225 years ago
Largest city
Gettysburg borough
Population 8,365.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Adams County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Adams County, Pennsylvania from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 717 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Adams County ranks

Position among the 67 counties of Pennsylvania, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn PennsylvaniaNationally
Population107,59431st of 67587th of 3,144
Land area518.6 sq mi45th of 672,013th of 3,144
Population density207 per sq mi26th of 67556th of 3,144
Median household income$84,09210th of 67450th of 3,143

Full data for Adams County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population107,594Vintage 2025 Population Estimates
Population in 2020103,814Vintage 2025 Population Estimates
2020 estimates base?103,854Vintage 2025 Population Estimates
Land area518.6 sq mi2025 Gazetteer Files
Water area3.1 sq mi2025 Gazetteer Files
Total area521.7 sq mi2025 Gazetteer Files
Population density?207 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$84,092American Community Survey 2020-2024 5-Year Estimates
Median home value$268,500American Community Survey 2020-2024 5-Year Estimates
Median age43.7American Community Survey 2020-2024 5-Year Estimates
Households40,841American Community Survey 2020-2024 5-Year Estimates
Housing units43,672American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
-271
936 births, 1,207 deaths
Net migration
+701
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 5 areas bordering Adams County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
York CountyPennsylvania33 mi473,197
Cumberland CountyPennsylvania21 mi277,270
Franklin CountyPennsylvania15 mi160,652
Frederick CountyMaryland13 mi302,883
Carroll CountyMaryland12 mi176,677

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 67 counties of Pennsylvania

Open the interactive Pennsylvania county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.